US8085973B2 - Method and device for the detection, at the correct time, of print marks located at regular intervals on a print web - Google Patents

Method and device for the detection, at the correct time, of print marks located at regular intervals on a print web Download PDF

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Publication number
US8085973B2
US8085973B2 US12/224,521 US22452107A US8085973B2 US 8085973 B2 US8085973 B2 US 8085973B2 US 22452107 A US22452107 A US 22452107A US 8085973 B2 US8085973 B2 US 8085973B2
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Prior art keywords
print
camera
processing unit
process data
web
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US12/224,521
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US20090041296A1 (en
Inventor
Bernhard Dirsch
Jörg Reh
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Siemens AG
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Siemens AG
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Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: REH, JORG, DIRSCH, BERNHARD
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0081—Devices for scanning register marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/20—Calculating means; Controlling methods
    • B65H2557/264—Calculating means; Controlling methods with key characteristics based on closed loop control

Definitions

  • the invention relates to a method and device for the detection, at the correct time, of print marks located at regular intervals on a print web.
  • Print marks are deployed as part of a register control process.
  • the colors of the individual printing mechanisms are to be printed in the correct position in relation to one another.
  • the print mark represents additional information, which is printed onto the material and serves only for control purposes. As well as being deployed for color register control, the print mark also serves for correct positioning during cutting (cut register control).
  • the detection time i.e. the time when the camera is activated, can be related in a defined manner to the position of the print mark, thereby allowing control of the subsequent steps of printing further colors or even cutting.
  • the print mark For detection at the correct time, it is therefore initially essential for the print mark generally to be in the image range of the camera. Generally one print mark is located in the region of 1 m of print web. In contrast an image range of the camera is 60 mm in height. It is therefore imperative that the camera detects the print mark. The additional requirement that the camera should detect the print mark as centrally as possible is of no less importance.
  • the camera is activated by way of a trigger system.
  • the drive system which controls the movement of the print web (i.e. the movement of the motors of the print cylinders transporting the print web)
  • the drive system emits trigger signals directly and these are converted by the cameras or the drive system emits pulse generator signals, from which a trigger signal is derived in a separate unit.
  • the units generating the trigger signals are hereby generally relatively far away from the cameras for technical reasons.
  • the signals therefore have to be routed over long distances at the machine.
  • interference signal injection can cause incorrect activation of the camera system.
  • Such interference originates particularly frequently from pulsed converters. Since the cables are laid by operators who frequently do not have adequate training, interference signal injection results to a significant degree in real systems.
  • EP 1 619 026 A2 discloses triggering an image recording unit by means of a control unit, namely as a function of a lead axle position of a lead axle defined in a printing machine. To allow this, the control unit communicates with at least one drive control system arranged downstream thereof of at least one group of pressure marks of the printing machine or also with a special processing and data processing unit.
  • the object of the invention is to allow detection of print marks at the correct time, providing better protection against interference signals, interference signal injection, etc. of all types.
  • the processing unit assigned to the camera primarily has one central task. Specifically process data from a drive control system, which controls movement of the print web, is fed continuously to the processing unit. The received process data is used correspondingly to calculate detection times for the camera.
  • the inventive method comprises two stages: in a first stage it is generally ensured that the print mark is shown on the camera image. In a second stage respective detection times are calculated, these being selected so that the print mark is shown centered (or another position criterion is met, for example that it is always shown bottom right, etc).
  • a number of initial detection times is first calculated (determined) by the processing unit based on the supplied process data, the initial detection times being coordinated with one another in such a manner that a print mark is shown on at least one image recorded at one of the initial detection times using the camera.
  • the initial detection times can be selected so that first partial image 1 , 5 , 9 and 13 of the first print web meter is photographed, then partial image 2 , 6 , 10 and 14 of the second print web meter, then partial image 3 , 7 , 11 and 15 of the third print web meter and then partial image 4 , 8 , 12 and 16 of the fourth print web meter.
  • the print mark is generally located on one of the partial images in each print web meter, i.e. on one image per rotation of the print cylinder, so that after four passes in the above-mentioned manner one print mark has been detected at some time, from which the processing unit is then able to conclude the positions of the other print marks.
  • the method also includes the activation of the camera at the initial detection times to record images and the evaluation of the recorded images by searching for a print mark on the images.
  • Initialization data is obtained by the processing unit as part of the evaluation.
  • the initialization data is simply an assignment of the information to the supplied process data by way of the print mark found. In other words the system “knows” from the initialization data where a print mark should be found on the print cylinder in each instance.
  • the inventive method starts this control with the processing unit calculating a first pass detection time based on the initialization data and the supplied process data, thus ensuring that a print mark is shown on an image recorded using the camera at the first pass detection time.
  • the camera is activated at the first pass detection time and an image is recorded. This image serves as a basis for the control. Generally one image is used respectively for the control but a number of images can also be taken into account (progressively) during the control.
  • the invention therefore firstly uses a processing unit, which is assigned to the camera, which does not require an external trigger signal but calculates the detection times, in other words the activation times for the camera, itself.
  • the invention therefore firstly uses a processing unit, which is assigned to the camera, which does not require an external trigger signal but calculates the detection times, in other words the activation times for the camera, itself.
  • the processing unit is integrated in the camera housing. This may be standard and this embodiment represents a particularly compact embodiment.
  • the register control can comprise a number of steps, for example when printing different colors, a number of cameras can also be provided accordingly.
  • a processing unit is assigned to each camera.
  • the initial detection times and the pass detection times, as mentioned above, are hereby respectively determined by the respective processing unit individually for the assigned camera.
  • the cameras therefore do not have to function synchronously.
  • the respective correction value is determined during the evaluation (of the images) based on a deviation of the print mark shown from a centered position.
  • the process data can include data relating to the speed of the print web.
  • the speed of the print web is in particular equal to the speed of a print cylinder transporting the print web.
  • the formulation “data relating to the speed” is intended to mean that a numerical value for the speed does not necessarily have to be available in a predetermined speed unit. Instead a relative value is sufficient, for example a numerical value between 0 and 1, which is understood accordingly by the processing unit assigned to the camera.
  • the process data can also include data relating to the position of a print cylinder transporting the print web and/or its acceleration and/or a printed page format. This can be so in particular in addition to the data relating to the speed of the print web.
  • the drive control system belonging to the inventive device does not have to be modified in this process in contrast to the prior art.
  • Process data of the type mentioned above is available in conventional drive control systems, said data being either measured data from sensors or data, which is related to control of the print cylinder motors, for example if a specific control current is related to the speed in a predefined manner. It is important that process data is understood to mean the outputting of numerical values, which can be used by the processing unit to calculate detection times.
  • FIG. 1 shows a printing machine arrangement with a device for the detection of print marks at the correct time according to the prior art
  • FIG. 2 shows an inventive device for the detection of print marks at the correct time.
  • FIGS. 1 and 2 show a symbolic representation of a rotary press with six printing mechanisms 10 , the print web not being shown in a continuous manner.
  • a print cylinder (not shown), which is rotated by a motor 12 , which is shown separately in FIGS. 1 and 2 .
  • the motors 12 are controlled by a drive control system 14 , each via their own cable. For the sake of clarity, a single common cable is shown in the figures.
  • Each printing mechanism 10 is assigned its own camera 16 .
  • Each camera 16 is hereby assigned a cable 18 .
  • the drive control system 14 generates trigger signals directly, these being fed to a register control unit 20 and being fed from this to the individual cameras 16 .
  • the drive control system 14 generates pulse generator signals, which are supplied via the cables 18 to the register control unit 20 , which then generates the trigger signals for the individual cameras 16 .
  • Interference signal injection can result in the region of the cables 18 .
  • the invention prevents this in that there is no need for trigger signals.
  • the drive control system 14 is connected to a common bus 22 , as is each individual camera 16 , in the invention shown in FIG. 2 .
  • the individual cameras 16 receive process data from the drive control system 14 by way of the common bus 22 .
  • the process data is data of the same type, as is used to control the motors 12 or as is received as response signals from the motors 12 by the drive control system 14 . There is therefore no need for data conversion in the drive control system 14 , but this latter can output data, which it has anyway, to the bus 22 .
  • the individual cameras 16 are respectively provided with a processing unit in the camera housing (not shown).
  • the register control unit 20 is likewise connected to the bus 22 but is only optional. It can supplement the individual processing units for example.
  • the process data determined via the bus 22 can include data relating to the position, speed, acceleration of the print web (of the print cylinders) and the production parameters (page format or print length).
  • the assigned processing unit can work out a strategy in each individual camera 16 , to determine how it is initially determined where the print marks are located. Based on the rotation of the print cylinders the processing unit develops a strategy to determine when the camera records images (initial detection times are determined) and a sequence of images is recorded detecting the various print web positions without a gap (optionally corresponding points on the print web for a number of rotations of the print cylinder), so that a print mark is detected at some point. The processing unit in the cameras 16 evaluates all the images and generates a data record (initialization data), which can then be used to calculate the position of the print mark as a function of the process data (for example the position of the print cylinder).
  • a data record initialization data
  • the actual control process can now start based on the initial assignment of detection times and process data. Detection times can be calculated for the individual cameras 16 by the respective processing units, it being still ensured based on the prior assignment and then taking into account measurement accuracy that the camera actually records a print mark. This is then controlled more specifically by the processing unit 16 .
  • the calculated detection times can be corrected by means of a correction value, if the print mark was not centered precisely in a previous image. This means that the print mark is recorded again, this time centered, in a subsequent image.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
US12/224,521 2006-03-01 2007-01-17 Method and device for the detection, at the correct time, of print marks located at regular intervals on a print web Expired - Fee Related US8085973B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102006009434A DE102006009434B4 (de) 2006-03-01 2006-03-01 Verfahren und Vorrichtung zum zeitrichtigen Erfassen von in regelmäßigen Abständen auf einer Druckbahn befindlichen Druckmarken
DE102006009434 2006-03-01
DE102006009434.4 2006-03-01
PCT/EP2007/050424 WO2007098984A1 (de) 2006-03-01 2007-01-17 Verfahren und vorrichtung zum zeitrichtigen erfassen von in regelmässigen abständen auf einer druckbahn befindlichen druckmarken

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US20090041296A1 US20090041296A1 (en) 2009-02-12
US8085973B2 true US8085973B2 (en) 2011-12-27

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US12/224,521 Expired - Fee Related US8085973B2 (en) 2006-03-01 2007-01-17 Method and device for the detection, at the correct time, of print marks located at regular intervals on a print web

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US (1) US8085973B2 (de)
JP (1) JP5106427B2 (de)
DE (1) DE102006009434B4 (de)
WO (1) WO2007098984A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008059584B4 (de) * 2008-11-28 2021-11-18 BST eltromat International GmbH Verfahren und Vorrichtung zur Regelung des Registers in einer Druckmaschine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5142139A (en) * 1990-02-22 1992-08-25 Toshiba Kikai Kabushiki Kaisha Apparatus for treating image information of printed material and discriminating same
EP0882588A1 (de) 1997-06-02 1998-12-09 Maschinenfabrik Wifag Registerhaltige Abstimmung von Druckzylindern einer Rollenrotationsmaschine
US6108436A (en) * 1996-12-02 2000-08-22 Q.I. Press Controls V.O.F. System for controlling registration of a web and method of use thereof
DE10117454A1 (de) 2001-04-06 2002-10-17 Rexroth Indramat Gmbh Verfahren zur Registerregelung
EP1266756A2 (de) 2001-06-13 2002-12-18 Hurletron, Incorporated Registersystem für eine Druckmaschine
WO2004094146A1 (de) 2003-04-22 2004-11-04 Siemens Aktiengesellschaft Druckmaschine und verfahren zum betrieb einer druckmaschine
EP1619026A2 (de) 2004-07-23 2006-01-25 Koenig & Bauer Aktiengesellschaft Druckmaschine mit einer Vorrichtung zur Triggerung einer Bildaufnahmeeinheit und/oder einer Beleuchtungseinrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3363872B2 (ja) * 2000-06-23 2003-01-08 株式会社東京機械製作所 切断見当及び印刷見当自動調整機能を有する同期制御装置
JP2002225237A (ja) * 2001-01-31 2002-08-14 Dainippon Printing Co Ltd 撮像システム
US20030145751A1 (en) * 2002-02-06 2003-08-07 Quad/Tech, Inc. Color registration control system for a printing press

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5142139A (en) * 1990-02-22 1992-08-25 Toshiba Kikai Kabushiki Kaisha Apparatus for treating image information of printed material and discriminating same
US6108436A (en) * 1996-12-02 2000-08-22 Q.I. Press Controls V.O.F. System for controlling registration of a web and method of use thereof
EP0882588A1 (de) 1997-06-02 1998-12-09 Maschinenfabrik Wifag Registerhaltige Abstimmung von Druckzylindern einer Rollenrotationsmaschine
DE10117454A1 (de) 2001-04-06 2002-10-17 Rexroth Indramat Gmbh Verfahren zur Registerregelung
WO2002081220A1 (de) 2001-04-06 2002-10-17 Rexroth Indramat Gmbh Verfahren zur registerregelung
EP1266756A2 (de) 2001-06-13 2002-12-18 Hurletron, Incorporated Registersystem für eine Druckmaschine
WO2004094146A1 (de) 2003-04-22 2004-11-04 Siemens Aktiengesellschaft Druckmaschine und verfahren zum betrieb einer druckmaschine
EP1619026A2 (de) 2004-07-23 2006-01-25 Koenig & Bauer Aktiengesellschaft Druckmaschine mit einer Vorrichtung zur Triggerung einer Bildaufnahmeeinheit und/oder einer Beleuchtungseinrichtung

Also Published As

Publication number Publication date
JP2009528185A (ja) 2009-08-06
US20090041296A1 (en) 2009-02-12
JP5106427B2 (ja) 2012-12-26
DE102006009434A1 (de) 2007-09-06
DE102006009434B4 (de) 2011-12-08
WO2007098984A1 (de) 2007-09-07

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